Just moved into a flat, which had been unoccupied for a while. Plugged TV in aerial point and got nothing. Initially I thought that the communal aerial system had been upgraded for digital and this flat was missed due to being unoccupied. However working on a hunch that the socket might be broken I took it off the wall. Touching together co-axial in the wall and the one that goes into the TV I get a good signal Socket is old so maybe solder joints and/or filter components have dried out.
However in the wall box there are 2 coxial cables, one entering from the top and one from the bottom and I get a TV signal on both. Both were connected to the back of the socket. I assume the one coming in the top is from the aerial on the roof but where could the other one be from?
There isn't another aerial point in the flat that I can find, so don't think the bottom cable goes to an extension. But if it's a long wire then it could be acting as an aerial and getting a signal. The bottom wire also looks newer too.
Also I assume that the bottom one doesn't go to the flat below, i.e. in series, that would mad wouldn't it?